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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package jdk.jfr.internal.periodic;

/**
 * Lookup key that can be used in a {@code Map} in
 * case hashCode and equals are incorrectly overridden.
 * <p>
 * {@code IdentityHashMap} can't be used as it will not preserve order.
 */
final class LookupKey {
    private final Object object;

    public LookupKey(Object object) {
        this.object = object;
    }

    public int hashCode() {
        return System.identityHashCode(object);
    }

    public boolean equals(Object that) {
        if (that instanceof LookupKey lookupKey) {
            return lookupKey.object == object;
        }
        return false;
    }
}